Describe the role of atmospheric carbon dioxide in
regulating earth's temperature. what happens when
excess carbon dioxide builds up?

What factors led to europe's global dominance in economic and political factors? what impacts did that dominance have on other peoples and environments?

What is the difference between emigrate and immigrate? ?

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.